RICHARDSON

Usage:

-ksp_type richardson

Options:

-ksp_richardson_scale

damping factor on the correction (defaults to 1.0) where xn+1 = xn + scale*B(b - A xn)

This method often (usually) will not converge unless scale is very small

Uses the matrix splitting A = I – (I – A).

Characterized by the iteration rk+1 = Pk+1(A) r0, where Pk+1(A) = (I – A)k+1.

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